If a creature with trample over planeswalkers is attacking a planeswalker and that planeswalker is removed from combat, the creature’s damage may be assigned to the defending player once all blocking creatures have been dealt lethal damage or, if there are no blocking creatures when damage is assigned, all its damage is assigned to the defending player. This is an exception to rule 506.4c, and it does not cause the creature to be attacking that player.
June 18, 2021 · Modern Horizons 2
If a creature with trample over planeswalkers is attacking a planeswalker and that planeswalker is removed from combat, the creature’s damage may be assigned to the defending player once all blocking creatures have been dealt lethal damage or, if there are no blocking creatures when damage is assigned, all its damage is assigned to the defending player. This does not cause the creature to be attacking that player.
July 13, 2013 · Magic 2014
Multiple instances of trample on the same creature are redundant.
June 17, 2011 · Commander 2011
rule 702.19e not present in this release
April 1, 2011 · Duel Decks: Knights vs. Dragons
Once an attacking band has been announced, it lasts for the rest of combat, even if something later removes banding or "bands with other" from one or more of the creatures in the band.
February 4, 2011 · Mirrodin Besieged
Once an attacking band has been announced, it lasts for the rest of combat, even if something later removes banding or “bands with other” from one or more of the creatures in the band.
October 1, 2010 · Scars of Mirrodin
Once an attacking band has been announced, it lasts for the rest of combat, even if
February 1, 2010 · Worldwake
Once an attacking band has been announced, it lasts for the rest of combat, even if something later removes banding or "bands with other" from one or more of the creatures in the band.